Bin sweep with multiple branches

1. A sweep system for moving particulate matter in a bin having a bin floor, the sweep system comprising:

a sweep apparatus having a center pivot and at least two branches connected to the center pivot to rotate about a substantially vertical axis of the central pivot, the branches being pivotally connected to the center pivot in a manner permitting a degree of free pivot movement of a said branch about a substantially horizontal axis independent of movement of other said branches, each of the branches including:

a sweep assembly having an inboard end for locating toward a central area of the bin and an outboard end for locating toward a peripheral area of the bin, each of the sweep assemblies including a particulate sweep structure configured to move the particulate matter toward the inboard end; and

a drive assembly mounted on the sweep assembly and having at least one wheel extending down to engage the surface of the bin floor such that rotation of the wheel drives the sweep assembly across the floor.

2. The system of claim 1 wherein each sweep assembly of each of the branches of the sweep apparatus separately powered by a motor.

3. The system of claim 2 wherein the motor of a said branch also powers the drive assembly for the branch.

4. The system of claim 1 wherein the sweep apparatus additionally comprises a connection structure connecting the branches of the sweep apparatus to the center pivot such that the branches rotate about the center pivot.

5. The system of claim 4 wherein the connection structure of the sweep apparatus includes:

an inner connector portion connected to one of the branches of the sweep apparatus; and

an outer connector portion mounted on a respective said branch of the sweep apparatus, the outer connector portion being pivotable with respect to the inner connector portion.

6. The system of claim 5 wherein the inner and outer connector portions each comprise a pair of arms, the arms being pivotally linked together.

7. The system of claim 6 wherein the arms of the inner and outer connector portions are connected together by a pivot pin passing through the arms of the connector portions.

8. The system of claim 7 wherein the arms of one of the connector portions includes multiple holes through which the pivot pin is mountable to permit adjustment of a distance between a said branch and the center pivot.

9. The system of claim 1 wherein the sweep apparatus includes two branches.

10. The system of claim 1 wherein the sweep apparatus includes three branches.

11. The system of claim 1 wherein the sweep assembly of at least one branch includes a plurality of interconnected paddles movable in a succession on a path along at least a portion of the sweep assembly between the inboard and outboard ends.

12. The system of claim 11 wherein the plurality of paddles are mounted on an endless loop member at spaced locations along the endless loop.

13. A sweep system for moving particulate matter in a bin having a bin floor, the sweep system comprising:

a sweep apparatus having a center pivot and at least two branches connected to the center pivot to rotate about a substantially vertical axis of the central pivot, the branches being pivotally connected to the center pivot in a manner permitting a degree of free pivot movement of a said branch about a substantially horizontal axis independent of movement of other said branches, each of the branches including:

a sweep assembly having an inboard end for locating toward a central area of the bin and an outboard end for locating toward a peripheral area of the bin, each of the sweep assemblies including:

a particulate sweep structure configured to move the particulate matter toward the inboard end and including a plurality of interconnected paddles movable in a succession on a path along at least a portion of the sweep assembly between the inboard and outboard ends;

a motor connected to the plurality of interconnected paddles to move the paddles along the path; and

a drive assembly mounted on the sweep assembly and having at least one wheel extending down to engage the surface of the bin floor such that rotation of the wheel drives the sweep assembly across the floor.

14. The system of claim 13 wherein the motor of a said branch also powers the drive assembly for the branch.

15. A system comprising:

a bin having a horizontal bin floor and a center sump extending into the bin floor;

a sweep apparatus resting on the bin floor, the sweep apparatus having a center pivot and at least two branches connected to the center pivot to rotate about a substantially vertical axis of the central pivot, the branches being pivotally connected to the center pivot in a manner permitting a degree of free pivot movement of a said branch about a substantially horizontal axis independent of movement of other said branches, each of the branches including:

a sweep assembly having an inboard end for locating toward a central area of the bin and an outboard end for locating toward a peripheral area of the bin, each of the sweep assemblies including:

a particulate sweep structure configured to move the particulate matter toward the inboard end and including a plurality of interconnected paddles movable in a succession on a path along at least a portion of the sweep assembly between the inboard and outboard ends;

a motor connected to the plurality of interconnected paddles to move the paddles along the path; and

a drive assembly mounted on the sweep assembly and having at least one wheel extending down to engage the surface of the bin floor such that rotation of the wheel drives the sweep assembly across the floor.

16. The system of claim 15 wherein the motor of a said branch also powers the drive assembly for the branch.